Sash-latch.



J. M. DE WITT.

SASH LATCH.

APPLICATION FILED NOV 19 1914- 1,128,233, Patented Feb. 9, 1915.

. ,90 M1!" Inventor:

g fit by @faw JAMES M. DE WITT, OF NEW YORK, Y.

SASH-LATGH.

Specification of Letters Patent.

Patented Feb. 9, 1915.

Application filed November 19, 1914. Serial No. 872,923.

To all whom it may concern:

Be it known that 1, JAMES M. DE Wrr'r, a citizen of the United States, and a resident of New York city, borough of Manhattan in the county of New York and State of New York, have invented certain new and useful Improvements in Sash- Latches, of which the following is a specification.

This invention relatesv to certain new and useful improvements in sash latches and particularly to sash latches for automatically locking the lower sash when said sash is brought into its lowermost position and which sash latch is simple in construction, strong and durable, effective in use and can be applied on new as well as on old sashes.

In the accompanying drawings in which like letters of reference indicate like parts in all the figures: Figure 1 is a vertical transverse sectional View through the lower part of the sash provided with my improved sash latch and also partof the sill on which the sash rests. Fig. 2 is a face View of the latch and frame. Fig. 3 is a horizontal sectional view on the line aa of Fig. 1.

The latch casing 1 is composed of an L- shaped piece of sheet metal which is rounded at its bend or angle on the outer surface as shown at 2. In the upright shank-3 this plate is provided with a longitudinal slot 4 into which a. fiat latch plate 5 fits snugly, which latch plate is provided at its lower end with an outwardly extending lug 6, the underside of which is beveled upward and outward as shown at 7. It should be noted that the lower end of the slot 4 terminates directly above the bottom curve 2 but does not extend into the curvature 2. The latch plate 5 is riveted to a fiat spring strip 8 which at its upper end is riveted to the back of the casing 1 and this spring is wider than the latch plate so that under no circumstances can it press the latch plate and its latch lug 6 forward and farther than the position which the latch plate has when it is flush with the front surface of the casing and thus forms an automatic check or stop and prevents the lower end of the latch plate being forced outward so far as to strike on the keeper in the sill of the window casing when the sash is being lowered. A button 10 projects from the front of the latch plate above the latch prong 6. The L- shaped latch casing as stated above is countersunk in the bottom rail 11 of the bottom sash 12 in the bottom surface of said bottom rail. and in the inner face, facing the room, and a recess 9 is formed in said rail behind the casing. On the inner sill strip 13 of the window casing a rectangular or L- shaped keeper plate 14 is countersunk in the upper surface and inner surface of said inner bottom sill member, which keeper plate is provided in the downwardly extending member with a notch 15 behind which a cavity 16 is formed in said sill strip 13 so that when the sash descends the beveled edge of the latch lug 6 can strike the upper edge of the plate 14 whereby the latch lug is forced back until its upper surface is beneath the upper edge of said notch whereupon the latch lug is thrown outward by the spring and catches on the keeper plate 14 thus forming a secure lock for the lower sash. When the window is to be raised all that is necessary is to press on the button 10 whereby the latch lug 6 is withdrawn sufliciently to become disengaged from the keeper plate 14 whereupon the sash can be raised. In order to facilitate raising the sash a U-shaped handle 17 is secured to the inner face of the bottom rail 11 of the sash some distance above the bottom so as to extend across the casing. When this handle is grasped to raise the window, either the thumb or some other finger will be in such position that the button 10 can be easily pressed inward to disengage the beveled edge of the latch lug 6 from the keeper plate 14 secured in the window sill. The rounded edge of the casing sets back slightly from the sash so that there is no danger of the bottom angle of the casing catchin on the edge of the keeper plate 14 and furt ermorethis rounded edge guides the parts.

so that the beveled edge of the latch lug can come in contact with the angle of the keeper plate without unduly straining any of the parts.

Having described my invention what I claim as new and desire to secure by Letters Patent is 1. The combination with a sash and a window casing, of a latch casing secured to the lower rail of the sash at the inside, a recess being formed behind said latch casing, said latch casing havin an upwardly extending longitudinal s ot, a latch plate fitted in said slot, a latch lug projecting from the outer face of said latch plate at the bottom thereof and having its underside beveled upward and outward, a button on said latch plate, a spring secured to the back of the latch casing, to which spring the latch plate is attached, a keeper platecountersunk in the inner sill plate of the window casing and having a notch for receiving the above mentioned latch lug, a recess being formed in the sill behind said notch in the keeper plate, substantially as set forth.

2. The combination with a sash, of a latch casing plate on the inner surface of the bottom rail of the sash, said casing plate having a longitudinal slot, a latch plate fitting in said slot, a latch lug projecting from the outer face of said latch plate at the bottom of the same and having its underside beveled upward and outward, a spring secured at its upper end to the upper end of the latch casing at the back and riveted to the back of the latch plate, which spring is wider than the latch plate and a keeper plate in the rear surface of the sill piece of the window casing and having a notch for receiving the beveled latch lug, substantially as set forth.

Signed at New York city, borough of Manhattan in the county of New York and State of New York.

JAMES M. DE WITT.

Witnesses:

WV. J. ARNOLD, WM. H. MoCoRD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

